How to use older libs in 32bit mode?

Peter Wemm peter at
Thu Nov 25 12:42:35 PST 2004

On Wednesday 24 November 2004 07:10 pm, Jean-Yves Avenard wrote:
> On 24/11/2004, at 6:06 PM, Michael R. Wayne wrote:
> > Sorry.  No success as in it cores.
> Exact same thing here. Any attempts to run a 32 bits executable on an
> AMD64 machines result in a coredump
> Jean-Yves

Things to check:

* Make sure you have COMPAT_IA32 in your kernel config.  For example,
this command should work:

peter at overcee[8:16pm]~/fbp4/hammer/sys/amd64/conf-120> sysctl kern.elf32
kern.elf32.fallback_brand: -1
(The important thing is that it prints something, not the value)

* Make sure you have NOT copied ld-elf or libc from an i386 system.
You *MUST* build at least these two on your machine.  How to check:

peter at overcee[8:17pm]~-123> strings /libexec/ | grep libmap32
If this comes up empty, you're in trouble.  Check that
/usr/libexec/ and /libexec/ are the same file.

If you are running 5.3-stable and not 5.3-release, you can check libc
like this:

peter at overcee[8:18pm]~-125> objdump --dynamic-syms /usr/lib32/ | grep fsbase
00026500 g    DF .text  0000002b _amd64_set_fsbase
00026580 g    DF .text  0000004a _amd64_get_fsbase

These will not be present on a 5.3-release system.

Oh wait a second.  Did you build your libraries with
WITH_LIB32=yes or by running ?  I have a suspicion
that will produce a bad library now.

BTW: it is helpful to do a ktrace/kdump and show the last few lines.
I suspect there will be a sysarch syscall, followed by a SIGSEGV.
Peter Wemm - peter at; peter at; peter at
"All of this is for nothing if we don't go to the stars" - JMS/B5

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